Also, the cheap train is better.
Prices in Thailand are cheaper than America.
I bought a very cheap radio yesterday just so I could throw it off the roof of my apartment and watch it shatter.
This is a single kanji with an い on the end, meaning you know it's probably an adjective. What's the adjective form of cheap? It's also cheap. Time to go to a 100円 shop and get some 安い goods, ammiright?
Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. You didn't learn that reading with this kanji, so here's a mnemonic to help you:
"Would you like this item for cheap?"
"Uh, yes (やす) please!"